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Old 23rd August 2005, 01:07 PM   #1
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Default Voltage reference in Jung regulators

Sigurd brought up the question or claim that LM431 is pretty OK. Some people wrinkle their noses but if you compare the data between LM431 and LM329, the 431 is better on most parameters except for tempco.

It seems also that Texas has the 431 more specified than National.

Notice that the dymanic impeance is much better and the noise is lower, and also the price.

I have used the 431 much in work and am very pleased with it just because it's very troublefree, has decent precision and cost little.

What do you say folks?

The discussion was started here

http://www.onsemi.com/pub/Collateral/TL431-D.PDF
http://www.national.com/pf/LM/LM329.html
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Old 23rd August 2005, 01:26 PM   #2
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ur avatar? ........sorry
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Old 23rd August 2005, 01:28 PM   #3
Electrons are yellow and more is better!
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Don't you know what this is by now? There are even more provokative lifeforms in South Africa.
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Old 23rd August 2005, 01:33 PM   #4
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Default provocative lifeform?

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Don't you know what this is by now? There are even more provokative lifeforms in South Africa.
Thx, I thought it was more connected to creating life(form)
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Old 23rd August 2005, 02:00 PM   #5
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TL431 is one of those electronics gems it's cheap and effective. However, I've seen clones from unknown manufacturers that seemed a bit sub-standard.
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Old 23rd August 2005, 04:11 PM   #6
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Exactly. The datasheets differs so if some parameter is important then you'll have to use a special brand, as in the case with ON vs. National.
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Old 23rd August 2005, 05:54 PM   #7
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the TL431 is a "reference avec opamp" -- and you can access the non-inverting input of the error amp and loop-compensate the circuitry if you are fashioning an LDO or switcher.

i haven't found problems in batches of TL431's

it's pretty remarkable how well this device operates given it's low cost.
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Old 27th August 2005, 03:38 PM   #8
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I missed this thread as I have ben busy with several audiorelated projects

Yes,
as far my research is concerned I have found that ONSEMI's TL431 BI/BV is the best audio voltage reference around (when used as a normal Zener diode).

Note, it must be from OnSEMI and it must be the TL or BV version of the TL431.


Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.


Datasheet can be found at

OnSemi's TL431
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Old 28th August 2005, 02:51 PM   #9
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Have you checked ADR42x from Analog Devices, not so bad either.

The incredible Invisus Super Regulator uses it.
Picture
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Thread
Invisus ultra super regulator
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Old 28th August 2005, 04:04 PM   #10
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Yes, I have checked the ADR42X (X = 0, 1, 3, 5), and they all
are not by far as good as TL431BI/BV from OnSemi.

Output impedance is almost a factor 10 better fo rthe TL431BI/BV.

Voltage noise is almost twice as good on the TL431.

See below:

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